Energy Efficiency

Inside cement mortar lining of the ductile iron pipes doesn't only ensure observation of the hygienic requirements at potable water transportation, but also improves the hydraulic propetries of the ductile iron pipelines.

Roughness factor (according to COLEBROOK formula) of the inner surface of the ductile iron pipe with inside cement-mortar lining is K - 0,03 for every single pipe. It is recommended to take K - 0,1 for DN 80-250 mm.; K - 0,08 for DN 300-700 mm.; K - 0, 05 for DN 700-1000 mm. for calculations when deigning pipeline systems out of ductile iron so that all friction losses in the assembled pipeline system are considered. that means that ductile iron pipes with inside cement-mortar lining permit to reduce hydraulic losses through friction in the pipeline to a considerable extent and correspond to all the modern energy conservation requirements.

The clear opening comparison between ductile iron and polyethylene pipes

DN,

мм

Ductile Iron pipes Svobodny Sokol,

Technical specifications1461-037-50254094-2008

Polyethylene Pipes PE-100 SDR 17,

ALL Union State Standard 18599-2001

Ratio of ductile iron pipe clear opening to PE clear opening

External diameter,

mm

Wall thickness with cement-mortar lining,

mm

Internal diametr,

mm

Passage area,

sq. mm

External diamener,

mm

Wall thickness, mm

Internal diameter, mm

Passage area,

sq. mm

80

98

9,0

80,0

5024

90

5,4

79,2

4924

1,02

100

118

9,0

100,0

7850

110

6,6

96,80

7356

1,07

125

144

9,0

126,0

12346

140

8,3

123,40

11954

1,04

150

170

9,0

152,0

18137

160

9,5

141,00

15607

1,16

200

222

9,3

203,4

32477

225

13,4

198,20

30837

1,05

250

274

9,8

254,4

50805

280

16,6

246,80

47815

1,06

300

326

10,2

305,6

73312

355

21,1

312,80

76807

0,95

350

378

12,7

352,6

97597

400

23,7

352,60

97597

1,00

400

429

13,1

402,8

127365

450

26,7

396,60

123474

1,03

500

532

14,0

504,0

199403

560

33,2

493,60

191258

1,04

600

635

14,9

605,2

287520

630

37,4

555,20

241974

1,19

700

738

16,8

704,4

389501

710

42,1

625,80

307426

1,27

800

842

17,7

806,6

510724

800

47,4

705,20

390386

1,31

900

945

18,6

907,8

646919

900

53,3

793,40

484145

1,31

1000

1048

19,5

1009,0

7991914

1000

59,3

881,40

609840

1,31

Ductile iron pipe and PE pipe clear passage area comparison DN 100 mm

a

With the same nominal diameter of ductile iron pipe and PE pipe the clear opening of the ductile iron pipe with inside cement-mortar lining is 30 % bigger than polyethylene one. in diameter range 80 - 1000 mm respectively.

Reliability

Unique properties of ductile irone provide pipelines with:

no corrosion in conjunction with high mechanical properties and functional features of spigot and socket connections;

high safety margin compared to other pipeline sysems (Сmar <3,0);

cold resistance (impact strength of ductile iron pipes does not change in the range from +20 Co to -60 Co)

Ductile iron pipes have less failure compared to pipelines of other materials.

Numerous tests have proven that along with the estimated permissible load ductile iron pipes have sufficient reserve reliability. It is ideal for complicated laying conditions.

Number of failure per every 100 km of water pipelines.

Water lines oservation of West Germany 1999 (Information given by Deutcher Verein des Gas Und Wasserfaches - German Water and Gas Providing Unity )

German Water and Gas Providing Unity gives the water pipe failure statistics (according to analyses more than 360 water service organizations, more than 126 000 km of potable water lines and about 5 million square km. of pipelines connected with living housing sector).

According to the statistics, ductile iron pipes have the least percentage of failure.

The data Pipe failure as a result of earthquakes in Japan, India and the USA (per 100 km)

Spreading of water pipelines on the example of some earthquake prone areas of Japan, China, India and the USA (depend on pipe material)

The statistics of pipeline failure during earthquakes on the territory of the USA, China and India 1989 - 2009 shows that ducile iron pipes in earthquake prone areas having the longest spreading have suffered less than other pipelines (4,4 failure per 100 km) from earthquakes more than 7 points Richter scale

The pressure level to break the pipe is more than maximum allowable rate.

Sources of information:

Japan Water Works Association « Damage to water Pipelines at the 1995 Hyogoken-Nanbu Earthquake».

Iain Tromans Department of Civil and Environmental Engineering Imperial College of Science, Technology and Medicine London,« Behaviour of buried water supply pipelines in earthquake zones», January 2004.

High Economic Efficiency

Economic effect during the stage of installation appears because of the absence of necessity to use power station, high-quality staff or special technical machines. Ductile iron pipes can be layed in the soil directly without preparing channel from sand. Simple and easy process of assembling ductile iron joint pipelines even when the temperature is below the zero temperature provides a high speed of assembling.

This is temporary reduce of the expenses, that in different cases has real cost of money.

Reducing the money spent on water line service

According to the statistics of the international and Russian scientific researches ductile iron water lines are admitted to be the most reliable pipes to be installed.

Longevity

The expected faultless service life of ductile iron pipeline systems:

In water supply networks under the condition of soil corrosion, stray current and absence of cathodic protection is 80 to 100 years;